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Funny story: my wife used to work on Keesler AFB here on the MS coast. It gets hot here. Really hot, with humidity to match. People from all over the world come to Keesler for training; many from countries or states where they're not exposed to high heat and humidity. So in many of the training buildings they have a chart like this posted above the urinals (and stall doors in the Women's room) as a reminder of the importance of staying hydrated.
Back in 2015 or so I was picking Stephanie up to take her to lunch. I went by the restroom before going to her office. Two urinals side-by-side, a man at the right one. I stepped up to the left one and started to take care of business. I didn't know the man, I'd never seen him before; he did not know me. They had the urine charts posted above the urinal. Without turning my head to the man I said "The older I get, the harder it is to get my stream of piss high enough to compare the color." He kind of tilted his head in my direction, looked straight ahead, stopped pissing, zipped up, and left in a hurry.
I still smile about that to this day.
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